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Hello jenny-electrowel,
To be able to record a GST amount only transaction in QuickBooks Online, you can create an expense or cheque transaction and enter amount 0.1 in two line items. You will add a tax code on the 1st line item (0.01) and the negative amount should be set up as Out of Scope. Then, manually enter the GST amount in the sales tax field.
Check the screenshot below for reference.

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